US4760266A - Device for the generation of thermal neutrons - Google Patents

Device for the generation of thermal neutrons Download PDF

Info

Publication number
US4760266A
US4760266A US06/912,931 US91293186A US4760266A US 4760266 A US4760266 A US 4760266A US 91293186 A US91293186 A US 91293186A US 4760266 A US4760266 A US 4760266A
Authority
US
United States
Prior art keywords
housing
moderator
cups
neutron
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/912,931
Inventor
Wolfgang Schulz
Original Assignee
Brown Boveri Reaktor GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brown Boveri Reaktor GmbH filed Critical Brown Boveri Reaktor GmbH
Assigned to BROWN, BOVERI REAKTOR GMBH reassignment BROWN, BOVERI REAKTOR GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCHULZ, WOLFGANG
Application granted granted Critical
Publication of US4760266A publication Critical patent/US4760266A/en
Assigned to ABB REAKTOR GMBH reassignment ABB REAKTOR GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BROWN BOVERI REAKTOR GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG
Assigned to SCHULZ, WOLFGANG reassignment SCHULZ, WOLFGANG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABB REAKTOR GMBH
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G4/00—Radioactive sources
    • G21G4/02—Neutron sources
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating

Definitions

  • the invention relates to a device for the generation of thermal neutrons, including a housing containing a transportable neutron source and a moderator and having a neutron outlet opening.
  • German Patent No. DE-PS 30 31 107 describes such a device. Normally, cost-intensive basic materials are needed for the production of neutron sources. Therefore, the need to improve the ratio of the source size to the number of thermal neutrons exiting the source housing has existed for a long time. However, the solutions to this problem suggested thus far by specialists continue to be unsatisfactory.
  • a device for the generation of thermal neutrons comprising a gas-filled housing having a wall with inner surfaces and a neutron outlet opening, a spherical moderator housing disposed in the gas-filled housing, a transportable neutron source disposed in the spherical moderator housing, and cups formed of moderating material disposed between the moderator housing and the inner surface of the wall of the gas-filled housing, the cups being spaced at a given distance from the inner surface of the wall of the housing, from the moderator housing and from each other defining spaces between the cups, and the spaces between the cups defining openings directed toward the neutron outlet opening.
  • the moderator cups serve both for the reflection of the neutrons primarily thermalized in the moderator housing and for the secondary moderation of a not inconsequential number of higher energy neutrons (E>E therm ) exiting the moderator housing.
  • the cups are coaxial to the moderator housing. This improves the reflection characteristic.
  • the housing wall is in the form of another outer cup having free ends forming the neutron outlet opening. This improves the effect of the secondary moderation.
  • neutron-permeable material enclosing the moderating material. This is done if a liquid is used as moderator.
  • brackets fastened to the cups and extended between the moderator housing and the inner surface of the wall of the gas-filled housing. This maintains the specified spacings between the cups.
  • the spherical moderator housing or ball has a step-shaped canal formed in the center thereof defining at least one shoulder and ending at opposite sides of the gas-filled housing, the neutron source being supported on the at least one shoulder. Due to the fact that the canal passes through from one side of the housing to the other, on one hand it is easy to introduce the neutron source into the moderator sphere or to remove it therefrom and on the other hand, if the housing is disposed in a water seal of purifier, there is assurance that water will flow through the canal.
  • the moderator housing has a center
  • the neutron outlet opening is disposed in a given plane
  • the cups are in the form of half shells having circular, ring-shaped openings in a plane running parallel to the given plane of the neutron outlet opening and intersecting the center of the moderator housing.
  • the neutrons secondarily moderated or reflected in the vicinity of the cups thus reach the neutron outlet opening along the shortest path.
  • the gas-filled housing includes a cylindrical part, and including a collimator with a collimator inlet side and at least one collimation path, the collimator inlet side having a plastic or synthetic plating, coating or lining disposed thereon defining a free, open collimation path, and a plastic or synthetic plating, coating or lining disposed on the cylindrical part of the housing extending in a continuous taper to the collimator inlet side and forming part of the plating on the collimator inlet side.
  • FIG. 1 is a diagrammatic cross-sectional view of the device according to the invention.
  • FIG. 2 is a cross-sectional view taken along the line II--II of FIG. 1;
  • FIG. 3 is a graph of the neutron spectrum of a neutron source
  • FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 1;
  • FIG. 5 is a view similar to FIG. 1 showing another embodiment of the invention.
  • a housing 2 which encloses a neutron source 1 and is formed of a hemispherically constructed shell 3 having free ends 4 that are extended in the form of a cylinder.
  • the cylindrical and the hemispherical parts of the housing 2 are also formed of aluminum.
  • the inner surface of the wall of the housing 2 is provided with a lining 6 of neutron-moderating material such as polyethylene.
  • a moderator housing 7 is centrally disposed in the hemispherical part of the housing 2.
  • the moderator housing 7 is spherical, is maintained in position by aluminum brackets 8 and contains a filling of moderating material. If plastic or synthetic material is used for the moderator, no moderator housing is needed. The moderator is then merely a plastic or synthetic ball.
  • a canal or channel 9 which is constructed as a stepped hole, penetrates the center of the moderator housing or ball 7 and extends from one side of housing 2 to the other, penetrating the wall thereof.
  • the stepped hole is constructed as a funnel 11 in order to facilitate the introduction of the neutron source 1.
  • spherical half shells or cups 12 Disposed between the moderator housing 7 and the inner surface of the wall of the housing 2 are several spherical half shells or cups 12 being shown in FIGS. 1, 2 and 4 or parabolic half shells or cups 12' being shown in FIG. 5 and being formed of moderating material, which maintain a distance from each other as well as from the inner surface of the wall of the housing 2 and from the moderator ball 7. This creates intermediate spaces 13 in which the neutrons are reflected by the surfaces of the cups 12. A secondary moderation of epithermal and fast neutrons takes place in the half shells. The neutrons experience their primary moderation in the moderator ball 7.
  • the half shells 12 are fastened to the brackets 8 extending between the moderator housing 7 and the inner surface of the wall of the housing 2.
  • Annular openings 14 of the half shells 12, which are best seen in FIG. 4, form a plane which runs through the center of the moderator housing 7 and parallel to the disc 5 of the cylindrical housing part 4.
  • the disc 5 forms a neutron outlet opening 15 of the housing 2.
  • the operating mode of the device will now be explained by way of a neutron spectrum of a Californium-252 source with the aid of FIG. 3.
  • the relative frequency H is plotted on the ordinate and the energy in MeV is plotted on the abscissa.
  • the mean neutron energy of this source approximates 2 MeV.
  • the source configuration is such that the fraction of primary neutrons emitted by the source 1 and having the greatest relative frequency in the associated source spectrum of the source 1 corresponding to a mean neutron energy of 2 MeV (FIG. 3), is primarily slowed down to thermal energy ranges in the moderator ball 7.
  • the shaded region 17 of the spectrum contains primary neutrons of higher energy (E>2 MeV) having thermalizations which proceed stepwise according to the half shells 12.
  • the primary neutrons having energy intervals in the source spectrum only slightly above 2 MeV are slowed down in the half shell adjacent the moderator housing 7.
  • the neutrons of the next higher energy intervals are slowed down in the central half shells and those with an even higher energy are slowed down in the outer half shell.
  • Primary neutrons of maximum energy experience their slowdown in the vicinity of the moderator lining 6 of the housing 2.
  • each interspace 13 furthermore the reflection of the thermal neutrons by the surfaces of the cups 12 and their dispersion in the direction toward the neutron outlet opening 15 of the housing 2 takes place.
  • the reflection can be increased by enclosing the half shells 12 in an aluminum sheath if the housing 2 is disposed in a water seal.
  • the number and thickness of the moderator half shells is determined in dependence on the respective source spectrum of the neutr
  • a further improvement of the thermal neutron yield is achieved in conjunction with a collimator 18 which is connected directly to the neutron outlet opening 15 and which has a collimator inlet side 20 with a plastic or synthetic plating 21 of predetermined or given thickness.
  • the plastic plating 21 of the collimator 18 reduces an absorption of thermal neutrons which, without such a plating, would take place due to the absorbing effect of the collimator material at the collimator side 20.
  • the lining 6 of housing 2 is extended to the collimation inlet side 20 in one continuous taper forming a part of the plating and thus additionally intensifying the secondary moderation and the reflection. Therefore, the plastic platings 21 and 6 are in effect an additional source of thermal neutrons.
  • a predetermined or given free space 22 in the region between the plane of the openings 14 of the moderator housing 7 and the plastic platings 21 and 6 is thus acted upon by a greatly increased thermal neutron flow.
  • Converting the unoriented neutron flow in the free space 22 into an extracted or isolated, oriented neutron flow is accomplished in a known manner by means of the collimator.
  • Collimators are required, for example, when objects are to be bombarded by an oriented neutron flow in order to determine their internal structure.
  • the collimator 18 has two collimation paths 19 indicated in phantom lines in FIG. 2.

Abstract

A device for the generation of thermal neutrons includes a gas-filled housing having a wall with inner surfaces and a neutron outlet opening, a spherical moderator housing disposed in the gas-filled housing, a transportable neutron source disposed in the spherical moderator housing, and cups formed of moderating material disposed between the moderator housing and the inner surface of the wall of the gas-filled housing, the cups being spaced at a given distance from the inner surface of the wall of the housing, from the moderator housing and from each other defining spaces between the cups, and the spaces between the cups defining openings directed toward the neutron outlet opening.

Description

The invention relates to a device for the generation of thermal neutrons, including a housing containing a transportable neutron source and a moderator and having a neutron outlet opening.
German Patent No. DE-PS 30 31 107 describes such a device. Normally, cost-intensive basic materials are needed for the production of neutron sources. Therefore, the need to improve the ratio of the source size to the number of thermal neutrons exiting the source housing has existed for a long time. However, the solutions to this problem suggested thus far by specialists continue to be unsatisfactory.
It is accordingly an object of the invention to provide a device for the generation of thermal neutrons, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known devices of this general type and which improves the ratio of the source capacity to the thermal neutrons produced
With the foregoing and other objects in view, there is provided, in accordance with the invention, a device for the generation of thermal neutrons, comprising a gas-filled housing having a wall with inner surfaces and a neutron outlet opening, a spherical moderator housing disposed in the gas-filled housing, a transportable neutron source disposed in the spherical moderator housing, and cups formed of moderating material disposed between the moderator housing and the inner surface of the wall of the gas-filled housing, the cups being spaced at a given distance from the inner surface of the wall of the housing, from the moderator housing and from each other defining spaces between the cups, and the spaces between the cups defining openings directed toward the neutron outlet opening.
The moderator cups serve both for the reflection of the neutrons primarily thermalized in the moderator housing and for the secondary moderation of a not inconsequential number of higher energy neutrons (E>Etherm) exiting the moderator housing.
In accordance with another feature of the invention, the cups are coaxial to the moderator housing. This improves the reflection characteristic.
In accordance with an added feature of the invention, the housing wall is in the form of another outer cup having free ends forming the neutron outlet opening. This improves the effect of the secondary moderation.
In accordance with an additional feature of the invention, there is provided neutron-permeable material enclosing the moderating material. This is done if a liquid is used as moderator.
In accordance with a further feature of the invention, there are provided brackets fastened to the cups and extended between the moderator housing and the inner surface of the wall of the gas-filled housing. This maintains the specified spacings between the cups.
In order to form a neutron holder, in accordance with yet another feature of the invention, the spherical moderator housing or ball has a step-shaped canal formed in the center thereof defining at least one shoulder and ending at opposite sides of the gas-filled housing, the neutron source being supported on the at least one shoulder. Due to the fact that the canal passes through from one side of the housing to the other, on one hand it is easy to introduce the neutron source into the moderator sphere or to remove it therefrom and on the other hand, if the housing is disposed in a water seal of purifier, there is assurance that water will flow through the canal.
In accordance with yet a further feature of the invention, the moderator housing has a center, the neutron outlet opening is disposed in a given plane and the cups are in the form of half shells having circular, ring-shaped openings in a plane running parallel to the given plane of the neutron outlet opening and intersecting the center of the moderator housing. The neutrons secondarily moderated or reflected in the vicinity of the cups thus reach the neutron outlet opening along the shortest path.
In accordance with a concomitant feature of the invention, the gas-filled housing includes a cylindrical part, and including a collimator with a collimator inlet side and at least one collimation path, the collimator inlet side having a plastic or synthetic plating, coating or lining disposed thereon defining a free, open collimation path, and a plastic or synthetic plating, coating or lining disposed on the cylindrical part of the housing extending in a continuous taper to the collimator inlet side and forming part of the plating on the collimator inlet side. It is therefore seen that it is possible to use the device in combination with a collimator. With this embodiment, the higher energy neutrons still flowing in the direction toward the neutron outlet opening after their primary moderation, are also moderated secondarily, thus contributing to a further improvement of the efficiency of the neutron source.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in device for the generation of thermal neutrons, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:
FIG. 1 is a diagrammatic cross-sectional view of the device according to the invention;
FIG. 2 is a cross-sectional view taken along the line II--II of FIG. 1;
FIG. 3 is a graph of the neutron spectrum of a neutron source;
FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 1; and
FIG. 5 is a view similar to FIG. 1 showing another embodiment of the invention.
Referring now to the figures of the drawings in detail and first, particularly, to FIGS. 1 and 2 thereof, there is seen a housing 2 which encloses a neutron source 1 and is formed of a hemispherically constructed shell 3 having free ends 4 that are extended in the form of a cylinder. A disc 5 formed of neutron-permeable material such as aluminum, extends perpendicular to the wall of the cylinder and bridges the free ends. The cylindrical and the hemispherical parts of the housing 2 are also formed of aluminum. The inner surface of the wall of the housing 2 is provided with a lining 6 of neutron-moderating material such as polyethylene. A moderator housing 7 is centrally disposed in the hemispherical part of the housing 2. The moderator housing 7 is spherical, is maintained in position by aluminum brackets 8 and contains a filling of moderating material. If plastic or synthetic material is used for the moderator, no moderator housing is needed. The moderator is then merely a plastic or synthetic ball.
A canal or channel 9, which is constructed as a stepped hole, penetrates the center of the moderator housing or ball 7 and extends from one side of housing 2 to the other, penetrating the wall thereof. The neutron source 1, which is supported by a shoulder 10 of the canal or stepped hole, is introduced from the end of the stepped hole having the larger diameter. In the vicinity of the housing wall, the stepped hole is constructed as a funnel 11 in order to facilitate the introduction of the neutron source 1.
Disposed between the moderator housing 7 and the inner surface of the wall of the housing 2 are several spherical half shells or cups 12 being shown in FIGS. 1, 2 and 4 or parabolic half shells or cups 12' being shown in FIG. 5 and being formed of moderating material, which maintain a distance from each other as well as from the inner surface of the wall of the housing 2 and from the moderator ball 7. This creates intermediate spaces 13 in which the neutrons are reflected by the surfaces of the cups 12. A secondary moderation of epithermal and fast neutrons takes place in the half shells. The neutrons experience their primary moderation in the moderator ball 7. The half shells 12 are fastened to the brackets 8 extending between the moderator housing 7 and the inner surface of the wall of the housing 2. This assures that the spacings, once selected, are maintained. Annular openings 14 of the half shells 12, which are best seen in FIG. 4, form a plane which runs through the center of the moderator housing 7 and parallel to the disc 5 of the cylindrical housing part 4. The disc 5 forms a neutron outlet opening 15 of the housing 2.
The operating mode of the device will now be explained by way of a neutron spectrum of a Californium-252 source with the aid of FIG. 3. The relative frequency H is plotted on the ordinate and the energy in MeV is plotted on the abscissa. As may be seen from the branch 16 of the curve, the mean neutron energy of this source approximates 2 MeV. The source configuration is such that the fraction of primary neutrons emitted by the source 1 and having the greatest relative frequency in the associated source spectrum of the source 1 corresponding to a mean neutron energy of 2 MeV (FIG. 3), is primarily slowed down to thermal energy ranges in the moderator ball 7. The shaded region 17 of the spectrum contains primary neutrons of higher energy (E>2 MeV) having thermalizations which proceed stepwise according to the half shells 12. For instance, the primary neutrons having energy intervals in the source spectrum only slightly above 2 MeV, are slowed down in the half shell adjacent the moderator housing 7. The neutrons of the next higher energy intervals are slowed down in the central half shells and those with an even higher energy are slowed down in the outer half shell. Primary neutrons of maximum energy experience their slowdown in the vicinity of the moderator lining 6 of the housing 2. In each interspace 13 furthermore the reflection of the thermal neutrons by the surfaces of the cups 12 and their dispersion in the direction toward the neutron outlet opening 15 of the housing 2 takes place. The reflection can be increased by enclosing the half shells 12 in an aluminum sheath if the housing 2 is disposed in a water seal. The number and thickness of the moderator half shells is determined in dependence on the respective source spectrum of the neutron source 1.
A further improvement of the thermal neutron yield is achieved in conjunction with a collimator 18 which is connected directly to the neutron outlet opening 15 and which has a collimator inlet side 20 with a plastic or synthetic plating 21 of predetermined or given thickness. This assures that the higher energy neutrons (E>Etherm) traveling from the moderator housing 7 in the direction of the neutron outlet opening 15, and hence not slowed down by the half shells, also experience a slowdown and reflection.
Beyond this, the plastic plating 21 of the collimator 18 reduces an absorption of thermal neutrons which, without such a plating, would take place due to the absorbing effect of the collimator material at the collimator side 20.
The lining 6 of housing 2 is extended to the collimation inlet side 20 in one continuous taper forming a part of the plating and thus additionally intensifying the secondary moderation and the reflection. Therefore, the plastic platings 21 and 6 are in effect an additional source of thermal neutrons.
A predetermined or given free space 22 in the region between the plane of the openings 14 of the moderator housing 7 and the plastic platings 21 and 6 is thus acted upon by a greatly increased thermal neutron flow. Converting the unoriented neutron flow in the free space 22 into an extracted or isolated, oriented neutron flow is accomplished in a known manner by means of the collimator. Collimators are required, for example, when objects are to be bombarded by an oriented neutron flow in order to determine their internal structure. The collimator 18 has two collimation paths 19 indicated in phantom lines in FIG. 2.
The foregoing is a description corresponding in substance to German Application No. P 35 34 760.0 dated Sept. 28, 1985, the International priority of which is being claimed for the instant application. Any material discrepancies between the foregoing specification and the aforementioned corresponding German application are to be resolved in favor of this latter.

Claims (10)

I claim:
1. Device for the generation of thermal neutrons, comprising a gas-filled housing having a wall with inner surfaces and a neutron outlet opening, a spherical moderator housing disposed in said gas-filled housing, a transportable neutron source disposed in said spherical moderator housing, and cups formed of moderating material disposed between said moderator housing and said inner surface of said wall of said gas-filled housing, said cups being spaced at a given distance from said inner surface of said wall of said gas-filled housing, from said moderator housing and from each other defining spaces between said cups, and said spaces between said cups defining openings directed toward said neutron outlet opening.
2. Device according to claim 1, wherein said cups have axes passing through the center of said moderator housing.
3. Device according to claim 1, wherein said housing wall of said gas-filled housing is in the form of another outer cup having free ends forming said neutron outlet opening.
4. Device according to claim 1, including neutron-permeable material enclosing said moderating material.
5. Device according to claim 1, including brackets fastened to said cups and extended between said moderator housing and said inner surface of said wall of said gas-filled housing.
6. Device according to claim 1, wherein said moderator housing has a step-shaped canal formed in the center thereof defining at least one shoulder and ending at opposite sides of said gas-filled housing, said neutron source being supported on said at least one shoulder.
7. Device according to claim 1, wherein said moderator housing has a center, said neutron outlet opening is disposed in a given plane and said cups are in the form of half shells having circular, ring-shaped openings in a plane running parallel to said given plane of said neutron outlet opening and intersecting said center of said moderator housing.
8. Device according to claim 1, wherein said gas-filled housing includes a cylindrical part, and including a collimator with a collimator inlet side and at least one collimation path, said collimator inlet side having a plastic plating disposed thereon defining a free, open collimation path, and a plastic plating disposed on said cylindrical part of said gas-filled housing extending in a continuous taper to said collimator inlet side and forming part of said plating on said collimator inlet side.
9. Device according to claim 1, wherein said cups are spherical.
10. Device according to claim 1, wherein said cups are parabolic, said moderator housing has a center, said neutron outlet opening is disposed in a given plane and said cups are in the form of half shells having circular, ring-shaped openings in a plane running parallel to said given plane of said neutron outlet opening and intersecting said center of said moderator housing.
US06/912,931 1985-09-28 1986-09-26 Device for the generation of thermal neutrons Expired - Lifetime US4760266A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3534760A DE3534760C1 (en) 1985-09-28 1985-09-28 Device for generating thermal neutrons
DE3534760 1985-09-28

Publications (1)

Publication Number Publication Date
US4760266A true US4760266A (en) 1988-07-26

Family

ID=6282303

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/912,931 Expired - Lifetime US4760266A (en) 1985-09-28 1986-09-26 Device for the generation of thermal neutrons

Country Status (5)

Country Link
US (1) US4760266A (en)
JP (1) JPH0652319B2 (en)
DE (1) DE3534760C1 (en)
IT (1) IT1197176B (en)
SE (1) SE460389B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853550A (en) * 1985-09-28 1989-08-01 Brown, Boveri Reaktor Gmbh Device for irradiating an object with a transportable source generating thermal neutrons
US6352500B1 (en) 1999-09-13 2002-03-05 Isotron, Inc. Neutron brachytherapy device and method
US6497645B1 (en) 2000-08-28 2002-12-24 Isotron, Inc. Remote afterloader
US6685619B2 (en) 1999-09-13 2004-02-03 Isotron, Inc. Methods for treating solid tumors using neutron therapy
DE10314484A1 (en) * 2003-03-31 2004-10-28 Forschungszentrum Jülich GmbH Decoupler system for neutron moderators
US6817995B1 (en) 2000-04-20 2004-11-16 Isotron ,Inc. Reinforced catheter connector and system
US20110049380A1 (en) * 2009-09-02 2011-03-03 Dubeau Jacques Neutron Energy Spectrometer
CN104511096A (en) * 2014-12-08 2015-04-15 南京中硼联康医疗科技有限公司 Beam shaper for neutron-capture therapy
US20160158578A1 (en) * 2014-12-08 2016-06-09 Neuboron Medtech Ltd. Beam shaping assembly for neutron capture therapy
RU2720707C2 (en) * 2016-01-08 2020-05-12 Неуборон Медтек Лтд. Beam forming element intended for use in neutron capture therapy

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6440099U (en) * 1987-09-04 1989-03-09

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB706503A (en) * 1950-12-05 1954-03-31 Ca Nat Research Council Method and apparatus for irradiation with neutrons of greater than thermal velocity
US3659106A (en) * 1970-09-21 1972-04-25 Atomic Energy Commission Portable neutron source using a plurality of moderating means
US3914612A (en) * 1974-08-26 1975-10-21 Us Energy Neutron source
US4300054A (en) * 1980-02-04 1981-11-10 Vought Corporation Directionally positionable neutron beam
DE3031107A1 (en) * 1980-08-16 1982-03-18 Gkss - Forschungszentrum Geesthacht Gmbh, 2000 Hamburg Antimony-beryllium neutron source for testing reactor components - esp. in cooling pool has radioactive antimony pref. embedded in beryllium around moderator and outlet bore
US4324979A (en) * 1979-06-21 1982-04-13 National Research Development Corporation Variable neutron collimator
US4464330A (en) * 1982-05-13 1984-08-07 The United States Of America As Represented By The Department Of Energy Apparatus for irradiating a continuously flowing stream of fluid
US4582999A (en) * 1981-02-23 1986-04-15 Ltv Aerospace And Defense Company Thermal neutron collimator

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB706503A (en) * 1950-12-05 1954-03-31 Ca Nat Research Council Method and apparatus for irradiation with neutrons of greater than thermal velocity
US3659106A (en) * 1970-09-21 1972-04-25 Atomic Energy Commission Portable neutron source using a plurality of moderating means
US3914612A (en) * 1974-08-26 1975-10-21 Us Energy Neutron source
US4324979A (en) * 1979-06-21 1982-04-13 National Research Development Corporation Variable neutron collimator
US4300054A (en) * 1980-02-04 1981-11-10 Vought Corporation Directionally positionable neutron beam
DE3031107A1 (en) * 1980-08-16 1982-03-18 Gkss - Forschungszentrum Geesthacht Gmbh, 2000 Hamburg Antimony-beryllium neutron source for testing reactor components - esp. in cooling pool has radioactive antimony pref. embedded in beryllium around moderator and outlet bore
US4582999A (en) * 1981-02-23 1986-04-15 Ltv Aerospace And Defense Company Thermal neutron collimator
US4464330A (en) * 1982-05-13 1984-08-07 The United States Of America As Represented By The Department Of Energy Apparatus for irradiating a continuously flowing stream of fluid

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853550A (en) * 1985-09-28 1989-08-01 Brown, Boveri Reaktor Gmbh Device for irradiating an object with a transportable source generating thermal neutrons
US6352500B1 (en) 1999-09-13 2002-03-05 Isotron, Inc. Neutron brachytherapy device and method
US6685619B2 (en) 1999-09-13 2004-02-03 Isotron, Inc. Methods for treating solid tumors using neutron therapy
US6770021B2 (en) 1999-09-13 2004-08-03 Isotron, Inc. Neutron brachytherapy device and method
US6817995B1 (en) 2000-04-20 2004-11-16 Isotron ,Inc. Reinforced catheter connector and system
US6497645B1 (en) 2000-08-28 2002-12-24 Isotron, Inc. Remote afterloader
DE10314484A1 (en) * 2003-03-31 2004-10-28 Forschungszentrum Jülich GmbH Decoupler system for neutron moderators
DE10314484B4 (en) * 2003-03-31 2006-01-26 Forschungszentrum Jülich GmbH Decoupling system for neutron moderators
US20110049380A1 (en) * 2009-09-02 2011-03-03 Dubeau Jacques Neutron Energy Spectrometer
US8653470B2 (en) * 2009-09-02 2014-02-18 3833364 Canada Inc. Neutron energy spectrometer
CN104511096A (en) * 2014-12-08 2015-04-15 南京中硼联康医疗科技有限公司 Beam shaper for neutron-capture therapy
US20160158578A1 (en) * 2014-12-08 2016-06-09 Neuboron Medtech Ltd. Beam shaping assembly for neutron capture therapy
US20160158579A1 (en) * 2014-12-08 2016-06-09 Neuboron Medtech Ltd. Beam shaping assembly for neutron capture therapy
TWI581822B (en) * 2014-12-08 2017-05-11 南京中硼聯康醫療科技有限公司 A beam shaping assembly for neutron capture therapy
TWI581821B (en) * 2014-12-08 2017-05-11 南京中硼聯康醫療科技有限公司 A beam shaping assembly for neutron capture therapy
US9889320B2 (en) * 2014-12-08 2018-02-13 Neuboron Medtech Ltd. Beam shaping assembly for neutron capture therapy
US9974979B2 (en) * 2014-12-08 2018-05-22 Neuboron Medtech Ltd. Beam shaping assembly for neutron capture therapy
RU2691322C2 (en) * 2014-12-08 2019-06-11 Нойборон Медтех Лтд. Irradiator for neutron capturing therapy
US10610704B2 (en) 2014-12-08 2020-04-07 Neuboron Medtech Ltd. Beam shaping assembly for neutron capture therapy
RU2720707C2 (en) * 2016-01-08 2020-05-12 Неуборон Медтек Лтд. Beam forming element intended for use in neutron capture therapy

Also Published As

Publication number Publication date
DE3534760C1 (en) 1987-05-07
JPH0652319B2 (en) 1994-07-06
IT8621614A0 (en) 1986-09-05
SE8603952L (en) 1987-03-29
IT8621614A1 (en) 1988-03-05
SE460389B (en) 1989-10-02
IT1197176B (en) 1988-11-30
SE8603952D0 (en) 1986-09-19
JPS6280600A (en) 1987-04-14

Similar Documents

Publication Publication Date Title
US4760266A (en) Device for the generation of thermal neutrons
KR920007772B1 (en) Moderator and beam port assembly for neutron radiography
US3227880A (en) Collimator for beams of high-velocity electrons
GB1126767A (en) Measuring system
US6008753A (en) Low radar cross-section (RCS) measurement chamber and associated measurement system
US4853550A (en) Device for irradiating an object with a transportable source generating thermal neutrons
Smith The geometry of emission from the Vela and the Crab pulsars
CN113724908A (en) Thermal neutron beam shaping device
ES457242A1 (en) Fast neutron reactor
US4511216A (en) High power laser dump
Hargrove et al. A new thermal neutron flux density standard
US3121794A (en) Scattering radiation shield
Kwok et al. A model of unpulsed very high energy gamma rays from the Crab Nebula and pulsar
US3248541A (en) Radioactivity device for measurement of properties of materials
JPS56168578A (en) Radiation type tomography apparatus
CN107863172B (en) Optical collimator
EP0183818B1 (en) Fast neutron moderator for accelerator in thermal neutron radiography system
Ueda et al. Characteristics of high-energy nuclear interactions at and above 1014 eV
SU1437929A1 (en) Device for shaping a beam of electrons for radiation therapy
BG63177B1 (en) Screening device of x-ray or gamma-rays
Carpenter High intensity, pulsed thermal neutron source
SU1262612A1 (en) Cassegra nian short-focus aerial
Leung et al. A model of nonthermal radiation from accreting X-ray pulsars
Hillas Processes for production of very high energy radiation
Demichelis et al. Chopper with typical curved slits as monochromator for cold neutrons

Legal Events

Date Code Title Description
AS Assignment

Owner name: BROWN, BOVERI REAKTOR GMBH, MANNHEIM, GERMANY A GE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCHULZ, WOLFGANG;REEL/FRAME:004888/0694

Effective date: 19860912

Owner name: BROWN, BOVERI REAKTOR GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHULZ, WOLFGANG;REEL/FRAME:004888/0694

Effective date: 19860912

STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

FPAY Fee payment

Year of fee payment: 4

AS Assignment

Owner name: SCHULZ, WOLFGANG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ABB REAKTOR GMBH;REEL/FRAME:006962/0312

Effective date: 19940317

Owner name: ABB REAKTOR GMBH, GERMANY

Free format text: CHANGE OF NAME;ASSIGNOR:BROWN BOVERI REAKTOR GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG;REEL/FRAME:006962/0291

Effective date: 19880729

FEPP Fee payment procedure

Free format text: PAT HOLDER CLAIMS SMALL ENTITY STATUS - SMALL BUSINESS (ORIGINAL EVENT CODE: SM02); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY

FPAY Fee payment

Year of fee payment: 8

SULP Surcharge for late payment
FPAY Fee payment

Year of fee payment: 12